diff --git a/lib/libesp32/berry/generate/be_fixed_global.h b/lib/libesp32/berry/generate/be_fixed_global.h
index 31e615b88..1718ced75 100644
--- a/lib/libesp32/berry/generate/be_fixed_global.h
+++ b/lib/libesp32/berry/generate/be_fixed_global.h
@@ -1,14 +1,15 @@
 #include "be_constobj.h"
 
 static be_define_const_map_slots(m_libglobal_map) {
-    { be_const_key(member, -1), be_const_func(m_findglobal) },
-    { be_const_key(setmember, 0), be_const_func(m_setglobal) },
+    { be_const_key(contains, -1), be_const_func(m_contains) },
+    { be_const_key(setmember, -1), be_const_func(m_setglobal) },
     { be_const_key(_X28_X29, -1), be_const_func(m_globals) },
+    { be_const_key(member, -1), be_const_func(m_findglobal) },
 };
 
 static be_define_const_map(
     m_libglobal_map,
-    3
+    4
 );
 
 static be_define_const_module(
diff --git a/lib/libesp32/berry/src/be_globallib.c b/lib/libesp32/berry/src/be_globallib.c
index 1d8267b95..9e00848c0 100644
--- a/lib/libesp32/berry/src/be_globallib.c
+++ b/lib/libesp32/berry/src/be_globallib.c
@@ -42,6 +42,18 @@ static int m_globals(bvm *vm)
     be_return(vm);
 }
 
+static int m_contains(bvm *vm)
+{
+    int top = be_top(vm);
+    if (top >= 1 && be_isstring(vm, 1)) {
+        const char * name = be_tostring(vm, 1);
+        int idx = be_global_find(vm, be_newstr(vm, name));
+        be_pushbool(vm, idx > -1);
+        be_return(vm);
+    }
+    be_return_nil(vm);
+}
+
 static int m_findglobal(bvm *vm)
 {
     int top = be_top(vm);
@@ -67,6 +79,7 @@ static int m_setglobal(bvm *vm)
 #if !BE_USE_PRECOMPILED_OBJECT
 be_native_module_attr_table(global) {
     be_native_module_function("()", m_globals),
+    be_native_module_function("contains", m_contains),
     be_native_module_function("member", m_findglobal),
     be_native_module_function("setmember", m_setglobal),
 };
@@ -76,6 +89,7 @@ be_define_native_module(global, NULL);
 /* @const_object_info_begin
 module global (scope: global, depend: BE_USE_GLOBAL_MODULE) {
     (), func(m_globals)
+    contains, func(m_contains)
     member, func(m_findglobal)
     setmember, func(m_setglobal)
 }